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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation SK39BHM4G

Name: SK39BHM4G
Brand: Taiwan Semiconductor Corporation
SKU: SK39BHM4G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SK39BHM4G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: SK39BHM4G.pdf

Description:: DIODE SCHOTTKY 90V 3A DO214AA

Quantity:: RFQ Add To RFQ list

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Inventory:5,992

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Product details

Overview

SK39BHM4G from Taiwan Semiconductor is a 3A, 90V Schottky barrier rectifier in DO-214AA (SMB) package, designed for low-loss freewheeling and reverse battery protection in automotive lighting and DC/DC converters. It features AEC-Q101 qualification, 0.85V max forward voltage at 3A and 25°C, 70A non-repetitive surge current, and 10,000 V/μs critical dV/dt rating.

For engineers reviewing the SK39BHM4G datasheet, SK39BHM4G pinout, SK39BHM4G application, or SK39BHM4G equivalent, key selection criteria include its 90V V_RRM, 125°C/150°C junction temperature range, moisture sensitivity level 1 compliance, and suitability for high-frequency, low-voltage power conversion where low forward drop and fast switching are required.

Technical Context

This Schottky rectifier uses a single-die construction with guard ring overvoltage protection and matte tin-plated leads solderable per J-STD-002. Its thermal design supports 23°C/W junction-to-lead resistance and operates across -55°C to +150°C storage and junction ranges.

The device delivers 100µA max reverse leakage at 90V and 25°C, drops to ≤2mA at 125°C, and maintains stable performance under 8.3ms half-sine surge conditions - enabling robust operation in automotive transients and industrial power rails.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	90 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in reverse-biased applications like reverse polarity protection.
I_F	3 A - Continuous forward current rating; supports steady-state conduction in 12–48V DC/DC output stages.
I_FSM	70 A - Peak non-repetitive surge current; withstands load dump or inductive kick events without failure.
V_F @ 3A, 25°C	≤0.85 V - Low forward voltage drop; reduces conduction loss and improves efficiency in high-current, low-voltage paths.
I_R @ 90V, 25°C	≤100 µA - Low reverse leakage; minimizes standby power loss in always-on automotive modules.
T_J Range	-55°C to +150°C - Extended junction temperature capability; enables deployment in under-hood automotive environments.
dV/dt	10,000 V/μs - High critical rate of rise; prevents false turn-on during fast-switching noise in SMPS circuits.

Pinout & Package

Package: DO-214AA (SMB), surface-mount plastic case with cathode band marking, 0.100g weight, UL 94V-0 molding compound, and JESD 201 Class 2 whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., ground or switch node) in freewheeling path; requires low-inductance layout.
Cathode	Forward current exit / reverse-blocking terminal	Marked by band; ties to higher-potential rail (e.g., input bus); handles full reverse voltage during off-state.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan.
Guard ring structure	Enhances edge termination robustness; raises actual breakdown voltage margin above rated 90V V_RRM.
Moisture sensitivity level 1	Zero bake requirement before reflow; compatible with standard SMT assembly without dry pack handling.
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and EU RoHS directives; supports environmentally regulated automotive and industrial supply chains.
High surge current capability	70A I_FSM enables use in circuits exposed to inductive energy release without derating or parallel devices.

Applications

Automotive LED Lighting	12V DC/DC Converter Output Rectification
Use Scenario: Reverse polarity protection and freewheeling in headlamp and DRL driver modules. IC Role / Device Role / Timing Role: Discrete Schottky rectifier providing unidirectional current path and transient clamping. Use Value: 0.85V V_F minimizes heat generation in space-constrained lamp housings; AEC-Q101 ensures field reliability over 15-year vehicle life.	Use Scenario: Secondary-side rectification in synchronous or asynchronous buck converters for infotainment power supplies. IC Role / Device Role / Timing Role: Freewheeling diode conducting during high-side FET off-time. Use Value: 70A I_FSM and 10,000 V/μs dV/dt prevent failure during MOSFET switching transitions and line transients.
Reverse Battery Protection	Industrial 24V Power Input Stage
Use Scenario: Series-connected protection in vehicle battery feed lines to block reverse connection damage. IC Role / Device Role / Timing Role: Forward-biased conduction path during normal operation; reverse blocking during misconnection. Use Value: 90V V_RRM exceeds 24V system surge requirements (ISO 7637-2 Pulse 5a); low V_F avoids excessive insertion loss.	Use Scenario: Input rectification and hold-up support in programmable logic controller (PLC) power inputs. IC Role / Device Role / Timing Role: Clamping and freewheeling element in discrete flyback or forward converter front ends. Use Value: -55°C to +150°C T_J range supports operation in uncooled control cabinets; SMB package enables automated placement on dense PCBs.

Automotive LED Lighting

12V DC/DC Converter Output Rectification

Use Scenario: Reverse polarity protection and freewheeling in headlamp and DRL driver modules.

IC Role / Device Role / Timing Role: Discrete Schottky rectifier providing unidirectional current path and transient clamping.

Use Value: 0.85V V_F minimizes heat generation in space-constrained lamp housings; AEC-Q101 ensures field reliability over 15-year vehicle life.

Use Scenario: Secondary-side rectification in synchronous or asynchronous buck converters for infotainment power supplies.

IC Role / Device Role / Timing Role: Freewheeling diode conducting during high-side FET off-time.

Use Value: 70A I_FSM and 10,000 V/μs dV/dt prevent failure during MOSFET switching transitions and line transients.

Reverse Battery Protection

Industrial 24V Power Input Stage

Use Scenario: Series-connected protection in vehicle battery feed lines to block reverse connection damage.

IC Role / Device Role / Timing Role: Forward-biased conduction path during normal operation; reverse blocking during misconnection.

Use Value: 90V V_RRM exceeds 24V system surge requirements (ISO 7637-2 Pulse 5a); low V_F avoids excessive insertion loss.

Use Scenario: Input rectification and hold-up support in programmable logic controller (PLC) power inputs.

IC Role / Device Role / Timing Role: Clamping and freewheeling element in discrete flyback or forward converter front ends.

Use Value: -55°C to +150°C T_J range supports operation in uncooled control cabinets; SMB package enables automated placement on dense PCBs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-3EYH09-M3/45	Same 90V V_RRM, 3A I_F, but TO-277 package (lower R_θJA = 50°C/W vs. 63°C/W); VF = 0.82V typ.	Higher power density; better thermal performance in high-ambient industrial settings.	Select when board-level thermal management is constrained and lead-free reflow profile allows TO-277 mounting.
ON Semiconductor SB390	90V V_RRM, 3A I_F, DO-214AA package, but AEC-Q101 not claimed; VF = 0.88V max; IR = 200µA max @ 25°C.	Lacks automotive qualification; higher leakage limits reduce suitability for always-on modules.	Acceptable for cost-sensitive industrial DC/DC where AEC-Q101 is not mandated.

Compared with VS-3EYH09-M3/45 and SB390, SK39BHM4G uniquely combines AEC-Q101 qualification, SMB packaging, and 100µA max reverse leakage at 25°C - making it the preferred choice for automotive lighting and reverse battery protection where qualification and low leakage are mandatory.

Availability

SK39BHM4G is available at Aetrix Electronics and suitable for automotive LED lighting, 12V DC/DC converter output rectification, and reverse battery protection requiring stable component supply and long-term lifecycle assurance.

Supply support for SK39BHM4G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in power discrete devices, analog ICs, and TVS components with global distribution and AEC-Q101 validation capability.

The SK3xBH series was developed specifically for automotive and industrial power conversion applications demanding high surge robustness, low forward voltage, and extended temperature operation in surface-mount form factors.

FAQ

What is the maximum junction temperature rating for SK39BHM4G?

The SK39BHM4G has a maximum junction temperature (T_J) rating of +150°C under continuous operation, with a minimum operating temperature of -55°C. This extended range supports deployment in under-hood automotive environments and industrial enclosures without forced cooling. The SK39BHM4G datasheet confirms this rating applies across the full voltage family, including the SK39BHM4G variant.

Is SK39BHM4G suitable for reverse battery protection in 24V automotive systems?

Yes, SK39BHM4G is suitable for reverse battery protection in 24V automotive systems due to its 90V V_RRM, which exceeds ISO 7637-2 Pulse 5a surge requirements (up to 75V), and its AEC-Q101 qualification. Its 0.85V forward voltage minimizes insertion loss, and the DO-214AA package enables compact, automated assembly. The SK39BHM4G's guard ring structure further enhances reliability during reverse connection events.

Does SK39BHM4G have moisture sensitivity level (MSL) certification?

Yes, SK39BHM4G is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and requires no baking prior to reflow soldering. This simplifies manufacturing logistics and eliminates moisture-related popcorning risk during standard lead-free reflow profiles. The MSL Level 1 classification is explicitly stated in the official Taiwan Semiconductor SK32BH–SK320BH datasheet for the SK39BHM4G variant.

What is the forward voltage specification for SK39BHM4G at 3A and 125°C?

The forward voltage (V_F) for SK39BHM4G is not specified at 3A and 125°C in the published datasheet; only the 25°C value (≤0.85V) and 100°C value (≤0.92V, interpolated from adjacent variants) are provided. Engineers should apply derating curves from Figure 4 of the SK32BH–SK320BH datasheet to estimate V_F at elevated temperatures. The SK39BHM4G's thermal resistance (R_θJL = 23°C/W) supports accurate junction temperature modeling in real-world layouts.

How does SK39BHM4G compare to SK36BHM4G in terms of reverse voltage and leakage?

SK39BHM4G has a 90V V_RRM and ≤100µA reverse leakage at 90V/25°C, while SK36BHM4G is rated for 60V V_RRM and ≤100µA at 60V/25°C. Both share identical forward voltage (≤0.85V), surge rating (70A), and package (DO-214AA). The SK39BHM4G provides higher reverse blocking margin for 24V+ systems, whereas SK36BHM4G offers tighter voltage tolerance in lower-voltage designs where leakage must be minimized at lower applied voltages.

SK39BHM4G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AA, SMB

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 90 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 850 mV @ 3 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 100 µA @ 90 V

Capacitance @ Vr, F:: -

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AA (SMB)

Operating Temperature - Junction:: -55°C ~ 150°C

SK39BHM4G FAQ

1.How can I place an order for SK39BHM4G through Aetrix?

Please submit a Request for Quotation (RFQ) for SK39BHM4G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SK39BHM4G reliable?

The price and inventory of SK39BHM4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK39BHM4G is usually 5 days.

3.What payment methods are accepted for SK39BHM4G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK39BHM4G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SK39BHM4G?

SK39BHM4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SK39BHM4G order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SK39BHM4G?

For technical support, including SK39BHM4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK39BHM4G requirements.

6.How does Aetrix verify that SK39BHM4G is sourced from the original manufacturer or authorized distributors?

All SK39BHM4G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SK39BHM4G meets industry standards.

7.What is the process for return or replacement of SK39BHM4G?

All SK39BHM4G units undergo pre-shipment inspection (PSI). If there is an issue with SK39BHM4G, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SK39BHM4G part is unused and in its original packaging.

Return procedure for SK39BHM4G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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